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A. A. HAAHR.

WELT SLASHING ATTACHMENT FOR WELT SHOE SEWING MACHINES.

APPLICATIQN FILED: JULY 1, I915.

' 1,194,621. Patented Aug. 15, 1916.

4 SHEETS-SHEET l.

Inveamm- MWM/ 4 A4 /AZZ,TW m w (QM a W A. A. HAAHR.

WELT SLASHING ATTACHMENT FOR WELT SHOE SEWING MACHINES.

APPLICATION FILED IULYI. 1915.

1,194,621. Patented Aug. 15, 1916.

4 SHEETS-SHEET 2- Ff;

A. A. HAAHR' WELT SLA SHING ATTACHMENT FOR WELT SHOE SEWING MACHINES.

APPLICATION FILED JULYJ. 1915.

1 1 94,62 1 Patented Aug. 15, 1916.

4 SHEETSSHEET 3.

ivuwea s A. A. HAAHR. WELT SLASHING ATTACHMENT FOR WELT SHOE SEWING MACHINES.

APPLICATION FILED JULY 1. 1915- 1,1 94,62 1. Patented Aug. 15, 1916.

4 SHEETS-SHEET 4.

i wwimw- ANTON AUGUST HAAHR, OF COPENHAGEN, DENMARK, ASSIGNOR TO UNITED SHOE MACEINERY COMPANY, OF PATTERSON, NEW JERSEY,

JERSEY.

A CDRPGRATION 0F NEVT VIELT-SLASHING ATTACHMENT FOB, NELT-SHOE-SEEVING IllTACI'IINES.

Specification of Letters Eatent.

Patented Aug. i5, 121%.

Application filed July 1, 1915. Serial l Io. 37,464.

- which it appertains to make and use the chine as is necessary to show tion of the improved welt slashing attach- 2 is a perspective view same.

The present invention relates to an improvement in welt slashing attachments for welt shoe sewing machines.

The object of the invention is to improve the construction and mode of operation of welt slashing attachments, and to this end the invention consists in the mechanism hereinafter described and particularly pointed out in the appended claims. 7 p

In the accompanying drawings illustrating the preferred form of the invention, Figure 1 is a side elevation of the upper part of so much of a welt shoe sewing mathe applicament thereto; Fig. of the lower part of the machine shown in Fig. 1; Fig. 8 is a side elevation of the improved welt slashing attachment on an enlarged scale; Fig. 4: is a front elevation of the parts shown in Fig. 3, partly in section; Fig. 5 is a plan of the toe of a shoe, the welt guide and welt slashing knife, showing the relative positions thereof during the welt slashing operation; Fig. 6 is a side elevation of the welt after the slashing operation, and Fig. 7 is a cross-section of the welt through one of the cuts.

The welt shoe sewing machine illustrated in connection with the preferred embodiment of the improved welt slashing attachment, is substantially the same as the machine illustrated and described in the patent to Eppler No. 1,108,560, dated August 25,1914t, and consists of a curved, hooked needle 1, a thread finger 2, a looper 3, a work rest a, a welt guide 5, a take-up device 6, and other parts not essential to the disclosure of'the present invention. These parts, together with their actuating mechanism, are constructed and arranged to operate in substantially the same manner as the corresponding parts of the ma'chineof the patent above referred to.

The welt slashing attachment is adapted to form a series of transverse, obliquely disposed cuts in the under side of the welt at certain requisite times during the operation of the stitch forming devices. The welt slashing operation is performed immediately after the welt guide has come to rest at the end of its forward movement and while it is pressing the welt against the shoe. The welt slashing is performed by a welt slashing knife 8 mounted in a frame 10 projecting rearwardly from the welt guide 5, the knife 8 being actuated through suitable connections by a cam 12 mounted on the main shaft of the machine. The cam 12 rotates in timed relation with the other parts of the sewing machine so as to cause the slashing knife 8, at the requisite times, to form a transverse cut in the welt at each operation of the stitch forming devices. The knife 8 isprovlded with a round shank received in a split nut 14, the arrangement being such that the length, depth, and angular relation of the cut to the welt may be regulated and adjusted. The welt slashing knife 8 is clamped in adjusted position in the nut 1A by means of the screw 16. The nut 1A is secured to a slide 18, which is received in the frame 10 and is adapted to reciprocate therein. The reciprocatory motion is imparted to the slide 18 by means of a slotted arm 20 of a bell crank lever 22 secured to the shaft 24:, mounted in suitable hearings on the frame of the machine. The slot 26 of the arm 20 engages a. pin and roll 28 projecting laterally from the slidelS. The other arm 30 of the bell crank lever 22 is provided with a slot which receives the pin 32 of a lower toggle arm 34. The upper toggle arm 36 is pivotally connected to an arm 38 of a bell crank lever 40 pivotally supported upon the frame of the machine. The other arm 42 of the bell crank lever 40 is provided with a pin and roll adapted to travel in the cam slot t-i of the cam 12. The toggle arms 3% and 36 are connected by means of a toggle pin l6 received in an angular slot in the forward end of a controlling lever 48 pivotally mounted at 50 upon the frame of the machine. The angular movement of the controlling lever is limited by a stop pin 52. A spring 54, one end of which engages the under side of the controlling lever 48, and the other end of which engages the frame of the machine, tends to maintain the lever 48 in raised position, as shown in Figs. 1 and 3. The angular slot in the forward end of the controlling lever 48 is composed of a toggle breaking slot 56 and a toggle-straightening slot 58 which, when the lever 48 is in lowered position, are respectively substantially horizontal and vertical. l/Vhen the controlling lever is in raised position as shown in Figs. 1 and 3, the toggle pin 46 is adapted to reciprocate in the horizontal or toggle-breaking slot 56, and at such time the movement imparted to the bell crank lever 40 by the active part 60 of the cam 12 is not communicated to the welt slashing knife 8 which, therefore, remains inoperative. When, however, the controlling lever is lowered so as to bring the toggle pin 46 within the vertical or toggle-straightening slot 58, the toggle arms 34 and 36 act as one link, and the movements imparted to the bell crank lever 40 by the active part 60 of the cam 12, operate to turn the bell crank lever 22 in its bearings, thereby causing the welt slashing knife 8 to be reciprocated to form the series of transverse cuts in the welt during the stitch forming operation.

When it is desired to form the cuts in the under side of the welt during the stitch forming operation, as for instance when sewing around the toe of the shoe, the controlling lever 48 is lowered. The lowering of the controlling lever is within the control of the operator and is effected by means of a rod 62, the upper end of which is connected to the controlling lever, the lower end of the rod being attached to the outer end of an arm 64 secured to one end of a shaft 66, rotatively mounted in a bracket 68 secured to the frame of the machine. An arm 70 secured to the other end of the shaft 66 is connected with a bell crank lever 7 2 by means of a link 74. The bell crank lever 72 is pivotally supported on a depending arm 7 6 from the bracket 68. To the lower end of the arm 7 8 of the lever 72 is secured a kneeplate 80. lVhen the operator presses his knee against the knee-plate, the bell crank lever 72 is caused to oscillate on its pivot. This oscillation of the lever 72 swings the arm 70, thereby rotating the shaft 66, depressing the outer end of the arm 64 to which is secured the rod 62, and bringing the controlling lever 48 into its lowered position. It will be observed that the welt slashing knife has a movement relative to and independent of the welt guide, so that, during such times as the welt slashing mechanism is inoperative, the welt guide moves toward and from the shoe without imparting any movement to the welt slashing knife.

The nature and scope of the present invention having been indicated, and the preferred form thereof having been specifically described, what is claimed is:

l. A welt shoe sewing machine having, in combination, stitch forming devices, a welt guide, means for moving the welt guide toward and from the shoe during the stitch forming operation, and a welt slashing knife mounted on the welt guide for forming a series of transverse cuts in the under side of the welt.

2. A welt shoe sewing machine having, in combination, stitch forming devices, a welt guide, means for moving the welt guide toward and from the shoe, a welt slashing knife mounted on the welt guide, and means for moving the welt slashing knife relatively to the welt guide.

3. A welt shoe sewing machine having, in combination, stitch forming devices, a welt guide, means for moving the welt guide toward and from the shoe, a welt slashing knife under the control of the operator and acting when thrown into operation to form a series of cuts in the under side of the welt during the stitch forming operation, and means for preventing movement of the welt slashing knife, except when thrown into operation by the operator.

4. A welt shoe sewing machine having, in combination, stitch forming devices, a welt guide movable toward and from the shoe,a welt slashing knife for forming a. series of transverse cuts in the under side of thewelt, and means for actuating the welt slashing knife to cut a slash in the welt independently of the movement of the welt guide, and means for throwing the knife into and out i of operation.

5. A welt shoe sewing machine having, in combination, stitch forming devices, a welt guide, a welt slashing knife, a cam for actuating the welt slashing knife, connections between the cam and the welt slashing knife, including a toggle, and a controlling lever having a toggle-breaking slot and a toggle-straightening slot.

6. A welt shoe sewing machine having, in combination, stitch forming devices, a welt guide movable toward and from the shoe, a welt slashing knife for forming aseries of transverse cuts in the under side of the welt, mounted on the welt guide, and means for adgusting the position of the welt slashing knife so as tovary the length and depth of the cuts.

7. welt shoe sewing machine having, in combination, stitch forming devices, a welt guide movable toward and from the shoe, a welt slashing knife for forming a series of transverse cuts in the under side of the welt,

a cam and suitable connections for actuating the Welt slashing knife While the Welt guide is stationary, and means under the control of the operator for rendering said connections operative and inoperative.

8. A Welt shoe sewing machine having, in combination, stitch forming devices, a Welt guide, means for moving the wait guide toward and from the shoe during the stitch forming operation, a Welt slashing knife mounted on the Welt guide for forming a se ries of transverse cuts in the under side of the Welt, mechanism for actuating the knife to form a cut in the Welt independently of the movement of the Welt guide, and means for throwing the knife into and out of operation.

ANTON AUGUST HAAHR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

